12v Cable

[Sfrazi]

I have a water feature which uses low voltage(only 5watts).
It has a transformer socket supplied which I can plug into our waterproof enclosure connected to waterproof sockets.

The problem I have is the length of the cable supplied for the transformer is only 5m long but the water feature is placed roughly 22m away.

I have bought water proof connectors and am looking to buy low voltage cable so I can extend the wire but I am confused on the type of cable to buy and whether I need 0.75mm(which is the current 5m one supplied) or do I need 1.5mm(Ive read some points on voltage drops which suggest I need a thicker cable).

Is there speciffcally a low voltage type of cable I need to buy or is any cable rated up to 240v fine?

Thanks

 

[RF Lighting]

What is the output voltage of the transformer?

Does the feature definitely only use 5 watts?

 

[Sfrazi]

I'll have to have a look when I get home but I know its uses little electric, there was an option to power using a 5w solar panel instead

 

[Gerrydelasel]

0.75mm square cable has a resistance of less than 30 ohms per km, or less than 0.7 ohms per 22m.
If your water feature uses 5 watts, that is 0.4amps at 12V, so the 22m cable would drop less than 0.3volts. Hardly a problem! Any cable suitable for use outdoors will do.

 

[EFLImpudence]

It'll be double that - 0.55V - include the return conductor as well.